<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>双飞翼</title>
    <link rel="stylesheet" href="双飞翼.css">
</head>

<body>
    <header>
        <div class="main">content</div>
        <div class="left">left</div>
        <div class="right">right</div>
    </header>
</body>

</html>